Chemical Weathering in Highsedimentyielding Watersheds
JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 110, F01008, doi:10.1029/2003JF000088, 2005 Chemical weathering in high-sediment-yielding watersheds, New Zealand W. Berry Lyons and Anne E. Carey Department of Geological Sciences and Byrd Polar Research Center, Ohio State University, Columbus, Ohio, USA D. Murray Hicks NIWA Research, Christchurch, New Zealand Carmen A. Nezat1 Byrd Polar Research Center, Ohio State University, Columbus, Ohio, USA Received 3 September 2003; revised 14 September 2004; accepted 30 November 2004; published 15 February 2005. [1] We have determined the chemical erosion yields for fifteen watersheds in New Zealand, ranging in size from 12.2 to 2928 km2. These rates, coupled with previously measured physical erosion yields, allow us to compare these two modes of landscape denudation. The physical erosion yields are some of the highest measured in the world. Although in most instances the chemical erosion yields are only a small fraction of the total erosion yields, the absolute values are very high. Our data strongly support the notion that chemical erosion rates are greatly influenced by the yield of physical erosion and that the rapid production of fresh surfaces as a result of high physical erosion rates and subsequent denudation is critical to the high chemical erosion yields observed. Citation: Lyons, W. B., A. E. Carey, D. M. Hicks, and C. A. Nezat (2005), Chemical weathering in high-sediment-yielding watersheds, New Zealand, J. Geophys. Res., 110, F01008, doi:10.1029/2003JF000088. 1. Introduction Vance et al., 2003]. In general, the net, large-scale erosional potential of a landscape is thought to increase with precip- [2] Over the past decade, a debate has occurred regard- itation, drainage area and slope [Montgomery et al., 2001].
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